Track and field

Track and field

Jay L. Clendenin / Los Angeles Times

Sprinter Allyson Felix of Los Angeles is the current and two-time world champion in the 200 meter. The USC graduate, 21, has drawn praise for volunteering to participate in a U.S. Anti-Doping Agency program, in which athletes will be subjected to an extraordinary number of drug tests to prove they are clean.

Sprinter Allyson Felix of Los Angeles is the current and two-time world champion in the 200 meter. The USC graduate, 21, has drawn praise for volunteering to participate in a U.S. Anti-Doping Agency program, in which athletes will be subjected to an extraordinary number of drug tests to prove they are clean. (Jay L. Clendenin / Los Angeles Times)

Sprinter Allyson Felix of Los Angeles is the current and two-time world champion in the 200 meter. The USC graduate, 21, has drawn praise for volunteering to participate in a U.S. Anti-Doping Agency program, in which athletes will be subjected to an extraordinary number of drug tests to prove they are clean.